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Sequanium was the proposed name for a new element found by the Romanian physicist Horia Hulubei in 1939. The name derived from the Latin word Sequana for the river Seine running through Paris where Hulubei worked at that time.
- Fontani, Marco (2005-09-10). "The Twilight of the Naturally-Occurring Elements: Moldavium (Ml), Sequanium (Sq) and Dor (Do)". International Conference on the History of Chemistry. Lisbon. pp. 1–8. Archived from the original on 2006-02-24. Retrieved 2007-04-08.
- Hulubei, H.; Cauchois, Y. (1939). "Nouvelles recherches sur l'élément 93 naturel". Comptes rendus. 209: 476–479.
- Mcmillan, Edwin; Abelson, Philip (1940). "Radioactive Element 93". Physical Review. 57 (12): 1185. Bibcode:1940PhRv...57.1185M. doi:10.1103/PhysRev.57.1185.2.